サラン繊維の冷延伸の光学的研究

抄録

For investigation of the mechanism of cold drawing of vinylidene chloride-vinyl chloride copolymer undrawn fibers which contain plasticizer, the birefringence, stress-strain curve of fibers drawn at room temperature in the air, and change of birefringence for various time held at stretched states have been measured. Changes of the foregoing physical properties have also been compared with those by drawing of films which does not contain plasticizer.
1. Results; the facts that the birefringence of aggregate parts of unisotropic micelles and molecular chains is negative, and the positive form-birefringence arises by addition of plasticizer in the copolymer substance were clearly proved. By increase of the molecular and micellar orientation, the formbirefringence increases and the birefringence of copolymer fibers which contain plasticizer approaches from negative maximum value to zero by cold drawing.
2. In both cases, the cold drawing process of undrawn fibers and films may be divided into the following three parts.
The orientation increases rapidly at the early stage, and then at the middle stage crystallization is accompanied with the increase in degree of orientation. Both the orientation and crystallization remains nearly unchanged at the last stage.